Barker, Chris, author
SAGE Publications, 2004
Buku Teks
Cole, G.D.H. (George Douglas Howard), 1889-1959
Routledge and Kegan Paul, 1955
Buku Teks
Macleride, Sean, author
Balai Pustaka, 1983
Buku Teks
Haynes, W. Warren (William Warren), 1921-1972
PRENTOCE-HALL, Inc, Englewood Clifts, 1969
Buku Teks
Fitagerald, Hiram E
0, 1982
Buku Teks